22 years of experience in marketing. Partner of Trout & Partners network of brand positioning experts. Internet Entrepreneur. I love to help you find your solution by explaining to you what I know. Call me from anywhere in the World (in English) or from Italy (in Italian).
In your landing you tell the problem(s) your app solves. Make them feel the pain and tell them that signing up will heal it.
So don't talk about "our app does this and that", but "do you have this problem? We have the solution"